Work-holder.



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Patented Dec. 1, 1914 "111mm MINIMUM IIIIIIIIIIIIII J. TEDELL.

WORK HOLDER.

APPLICATION FILED DEO. 9. 1910.

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J. TEDELL.

WORK HOLDER.

APPLICATION FILED DBO. 9. 1910.

Patented Dec. 1, 1914.

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J. TEDELL.

WORK HOLDER.

APPLICATION FILED Duo. 9, 1910.

`Patented Dec. 1, 1914,

MMI.

THE MORRIS 1ErES C0 PHOTu-LITM UNIT STATES FFICE.

JOHN TDELL, OF MOLINE, ILLINOIS, ASSIGNOR TO ROCK ISLAND PLOW COMPANY,0F ROCK ISLAND, ILLINOIS, A CORPORATION OF ILLINOIS.

WORK-HOLDER.

Application filed. December 9, 1910.

To all whom t may concern:

Be it known that I, JoiINTnDnLL, a citizen of the United States ofAmerica, and resident of Moline, Rock Island county, Illinois, haveinvented a certain new and useful Improvement in Work-I'Iolders, ofwhich the following is a specification. h y

My invention relates to means for holding in place the object to beacted upon by a machine. j

The object of my invention is to provide improved means for securely andeffectively holding the particular object in place to be acted upon bythe machine while the desired action of the machine upon such object isbeing performed, and to automatically release the means for so holdingthe object in place when the action of the machine upon the object hasbeen completed. rlhis result is accomplished by means of a clampingmember which, automatically and at the proper time in the action of themachine, is brought to bear upon and clamp in place the object to beacted upon by the machine, which clamping mechanism is thenautomatically released as and when the machine has completely acted uponthe object.

I shall herein describe and illustrate my invention in conjunction witha machine known more particularly as a bull dezer which machine isdesigned for the purpose of bending flat objects; but it will hereafterbecome apparent that the inventionis in no sense concerned with theparticular construction of the machine, or withthe character of themachine itself, but has to do with the means by which the work is heldin place.

I have also chosen in connection with the description and illustrationof my invention, as the object to be bent by this rmachine, what isknown as a plow point, but it will become apparent that the inventionclaimed herein is in no sense limited to the bending of a plow point,but may be employed to hold other objects in place.

In the accompanying drawings Figure 1 is a plan of a machine forbending` plow points, which machine is equipped with work-holdingmechanism embodying the principles of my invention, whereby the plowpoint is securely held in place during the operation of bending thesame. Fig. 2 is a detail section on line 2-2 in Fig. 1. Fig. 3 is across section on line 33 in Fig.

Specification of Letters Patent.

Patented Dec. 1, 1914:.

serial No. 596,424.

of the mechanism for bending the plow` point, showing the plow point inposition to be bent, and showing the bent position thereof in dottedlines. Fig. 5 is a section on line 5-5 in Fig. 1. Fig. 6 is an endelevation of the machine shown in Fig. 1. Fig. 7 is a detail sideelevation of the rear end portion of the said machine.

As thus illustrated, my invention comprises a horizontal table A forsupporting the plow point B. Upon the forward end of said table astationary die C is secured, and a movable die D is mounted to move backand forth. The said movable die is secured to a reciprocating plate d,which is operated in any suitable manner, and which has a bar (Z1secured to the top thereof. In this way the die D is actuatedhorizontally toward and away from the stationary die C,

the die I) sliding back and forth on the table A, whereby the plowpoints B are bent into the shape indicated in dotted lines at b in Fig.el.

'.lhe clamping ioll E is mounted at the lower end of the swinging linkc, and is adapted to bear upon` the bar (Z1, whereby the plate (l isheld down during the bending operation. The said link is mounted uponthe eccentric cam e1, which latter can be rotated to raise and lower thesaid link, so as to vary the pressure of the roll on the plate. The linkc is provided with lugs e2 adapted to engage the stop a on the frame a1that rises from the table A, whereby the swinging movement of the roll Eis limited in one direction. It will be seen that when the plate (Zmoves inward the roll E passes un der the center of its swing andproduces a powerful downward thrust, whereby the plow point is firmlyand securely heldin place during the bending or swaging opera tion. Thenwhen the plate l moves outward, the roll E automatically swings outwardand upward, thus discontinuing its pressure upon the plate d, andpermitting a fresh plow point to be adjusted in place of the one thathas been operated upon.

It is evident that if means are provided for holding or clamping thework thus sesurely in place when acted upon by the dies, the action ofsuch clamp must be withdrawn as or before the moving die retracts in theopposite direction, because the continued application of such clamp uponthe work in the retraction of the die would tend to draw the bent objectback again into its former shape. But with the clamping means, as isevident, which constitutes my invention, the f pressure is brought tobear upon the object to be bent only while the dies are acting to bendthe object, this pressure being automatically withdrawn as and when themoving die retracts or moves in the opposite direction.

At a point farther toward the rear of the machine, and upon the tablethereof, the plow point is held between two adjustable blocks F and Gr,the latter being secured in place by bolts g that extend through slotsin the table and also through slots in the block, whereby the positionof the latter may be varied .at will. The block F is secured in place bybolts f that extend through slots in the table and block, whereby theposition of the latter can be varied at will. The table is provided witha flange or rib a2 through which the set screws f1 extend to engage theouter side of the clamping block F, whereby the position of the lattercan be nicely and accurately adjusted in a direction transverse of theplow point. The table is also provided with a slot a3, and in this slotthe clamping bolts H and I of the blocks A and 2' are adapted to slide.The block it engages the rear end of the plow point, and the block z' isprovided with set screws l that engage the block 7i, whereby theposition of the latter may be accurately adjusted. lThe block z' hasteeth 2 adapted to engage the ratchet teeth a4 on the table. Thus theblock z' can be adjusted along the said teeth, and then the `set screwsl can be employed for adjusting the block into position. The bolts IIand I have liattened heads h1 `and 3, on the under side of the table,which can be twisted around to pass through the slot a3 when it isdesired to remove the blocks. Thus, with this arrangement the plowpoints can be accurately adjusted into position and themechanism forholding the same canbe adjusted to hold plow points of dilferent sizesor shapes. A. worm gearing J, of any suitable character, and operated bya handle j, is provided for adjusting the eccentric el, whereby thepressure of the roll E upon the work is varied at will.

I have thus particularly described the bull dozing machine as it iscalled, although the particular details of construction are not a partof my invention, the same being the means whereby the work is bent inposition lagainst buckling while acted upon by the a table forsupporting the said dies, means for positioning the work between thesaid dies, and a swinging member operating aui tomatically to increasethe pressure exerted by the movable die on the work upon the saidtable.`

2. In a machine of the class described, the combination of areciprocating element, a freely swinging link, and a roll on the lowerend of said link, adapted to bear upon said element to hold the latterin place, the swinging movement of the link operating to alternatelyincrease and decrease the pressure of said roll on the said element.

8. In a machine of the class described, a stationary die, a movable die,a freely swinging element, a plate carrying the mov able die, a bar onsaid plate, and a roll on the end of said element, said roll engagingsaid bar, to prevent the movable die from rising, the swinging movementof said element serving automatically to vary the pressure of said rollon the bar.

4. In a machine of the class described, a reciprocating element whichcovers the work, a roll for holding the said element down, and a freelyswinging element upon the lower end of which said roll is mounted, theback and forth swinging movement of the roll serving automatically toincrease or decrease the pressure exerted by said reciprocating elementon said work to thereby clamp and release the work.

5. In a machine of the class described, a table with a series of ratchetteeth thereon, a block provided with teeth for engaging said ratchetteeth, means connecting the block with the table, set screws extendingthrough said block, and a block engaged by said set screws, said secondblock adapted to engage the work.

Signed by me at Rock Island, Illinois, this 2nd day of December 1910.

JOHN TEDELL.

Copies nf this patent may 'be obtained for ve cents each, by addressingthe Commissioner of Patents, y

Washington, D. C.

